A method for handling access requests at multiple PoPs using the sharing of NAS information between the PoPs, enabling each PoP to maintain its own, independent, database of user records. When an access request is received, it is forwarded to a specific PoP designated as the user's “home PoP”. This...http://www.google.se/patents/US6895434?utm_source=gb-gplus-sharePatent US6895434 - Sharing of NAS information between PoPs
